Greetings all-
I'm on a quest to do some serious tuning to some of my production systems. All
are on CentOS 5.x ranging from 5.0 to 5.4. I've been reading up on the various
IO schedulers available in the kernel and I'm hoping some of you can lend some
insightful suggestions. I typically have three classes of system in production:
1. Storage/DB - Backend nodes for the application servers, MySQL, NFS storage
serving to frontend nodes (deadline?)
2. Web/SSL - Frontend nodes serving up web application (PHP/MYSQL), heavy SSL
{en/de}cryption with both HTTPS/Apache as well as branch locations connecting
via OpenVPN (cfq?)
3. Telephony/Communications - VoIP, usually Asterisk (full signaling + media
services), massive context switching, very timing sensitive (Meetme
conferencing, IAX2 trunk mode, etc) (deadline?)
In my reading, I've found most people recommend deadline for DB intensive
systems. CFQ seems to be recommended for most other uses. Noop and as seem to
be irrelevant. Is this correct or am I way off base?
I'm not currently under any enormous load on any of these systems, but I'm
planning for growth and would like to see how different schedulers can make a
difference.
I welcome your suggestions and experiences. :-)
--Tim
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